#include <iostream>
#include <string>
#include <pthread.h>
#include <unistd.h>

const int num =5;
pthread_mutex_t gmutex=PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t gcond=PTHREAD_COND_INITIALIZER;  

void *Wait(void *args)
{
    std::string name=static_cast<const char*>(args);
    while(true)
    {
        pthread_mutex_lock(&gmutex);
        pthread_cond_wait(&gcond,&gmutex);//线程等待的位置
        usleep(10000); 
         std::cout<<"I am "<<name<<std::endl;

         sleep(1);

         pthread_mutex_unlock(&gmutex);

    }
}

int main()
{
    pthread_t threads[num];
    for(int i=0;i<num;i++)
    {
        char *name=new char[1024];
        snprintf(name,1024,"thread-%d",i+1);
        pthread_create(threads+i,nullptr,Wait,(void*)name);
    }
    while(true)
    {
        //pthread_cond_signal(&gcond);//单个线程唤醒
        pthread_cond_broadcast(&gcond);//多个线程同时唤醒
        std::cout<<"唤醒一个线程..."<<std::endl;
        sleep(2);
    }

    for(int i=0;i<num;i++)
    {
        pthread_join(threads[i],nullptr);
    }
    return 0;
}
